Texas Instruments AM1808 - Page 174

AM1808
SPRS653E –FEBRUARY 2010–REVISED MARCH 2014 www.ti.com
6.18.3 I2C Electrical Data/Timing
6.18.3.1 Inter-Integrated Circuit (I2C) Timing
Table 6-85 and Table 6-86 assume testing over recommended operating conditions (see Figure 6-41 and
Figure 6-42).
Table 6-85. Timing Requirements for I2C Input
1.3V, 1.2V, 1.1V, 1.0V
NO. Standard Mode Fast Mode UNIT
MIN MAX MIN MAX
1 t
c(SCL)
Cycle time, I2Cx_SCL 10 2.5 μs
2 t
su(SCLH-SDAL)
Setup time, I2Cx_SCL high before I2Cx_SDA low 4.7 0.6 μs
3 t
h(SCLL-SDAL)
Hold time, I2Cx_SCL low after I2Cx_SDA low 4 0.6 μs
4 t
w(SCLL)
Pulse duration, I2Cx_SCL low 4.7 1.3 μs
5 t
w(SCLH)
Pulse duration, I2Cx_SCL high 4 0.6 μs
6 t
su(SDA-SCLH)
Setup time, I2Cx_SDA before I2Cx_SCL high 250 100 ns
7 t
h(SDA-SCLL)
Hold time, I2Cx_SDA after I2Cx_SCL low 0 0 0.9 μs
8 t
w(SDAH)
Pulse duration, I2Cx_SDA high 4.7 1.3 μs
9 t
r(SDA)
Rise time, I2Cx_SDA 1000 20 + 0.1C
b
300 ns
10 t
r(SCL)
Rise time, I2Cx_SCL 1000 20 + 0.1C
b
300 ns
11 t
f(SDA)
Fall time, I2Cx_SDA 300 20 + 0.1C
b
300 ns
12 t
f(SCL)
Fall time, I2Cx_SCL 300 20 + 0.1C
b
300 ns
13 t
su(SCLH-SDAH)
Setup time, I2Cx_SCL high before I2Cx_SDA high 4 0.6 μs
14 t
w(SP)
Pulse duration, spike (must be suppressed) N/A 0 50 ns
15 C
b
Capacitive load for each bus line 400 400 pF
Table 6-86. Switching Characteristics for I2C
(1)
1.3V, 1.2V, 1.1V, 1.0V
NO. PARAMETER Standard Mode Fast Mode UNIT
MIN MAX MIN MAX
16 t
c(SCL)
Cycle time, I2Cx_SCL 10 2.5 μs
17 t
su(SCLH-SDAL)
Setup time, I2Cx_SCL high before I2Cx_SDA low 4.7 0.6 μs
18 t
h(SDAL-SCLL)
Hold time, I2Cx_SCL low after I2Cx_SDA low 4 0.6 μs
19 t
w(SCLL)
Pulse duration, I2Cx_SCL low 4.7 1.3 μs
20 t
w(SCLH)
Pulse duration, I2Cx_SCL high 4 0.6 μs
21 t
su(SDAV-SCLH)
Setup time, I2Cx_SDA valid before I2Cx_SCL high 250 100 ns
22 t
h(SCLL-SDAV)
Hold time, I2Cx_SDA valid after I2Cx_SCL low 0 0 0.9 μs
23 t
w(SDAH)
Pulse duration, I2Cx_SDA high 4.7 1.3 μs
28 t
su(SCLH-SDAH)
Setup time, I2Cx_SCL high before I2Cx_SDA high 4 0.6 μs
(1) I2C must be configured correctly to meet the timings in Table 6-86.
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